M88 and M91 (lefty7283)

M88 and M91

[106 Messiers down, 4 more to go](i.imgur.com/hxBr7J8.png). I've also made an [annotated version of this image highlighting all the faint galaxies in the background.](i.imgur.com/jdQzJ2Z.jpg) Captured over 5 nights in March/April, 2020 from a bortle 7 zone.

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**[Equipment:](i.imgur.com/BYyK1wu.jpg)**

* TPO 6" F/4 Imaging Newtonian

* Orion Sirius EQ-G

* ZWO ASI1600MM-Pro

* Skywatcher Quattro Coma Corrector

* ZWO EFW 8x1.25"/31mm

* Astronomik LRGB+CLS Filters- 31mm

* Astrodon 31mm Ha 5nm, Oiii 3nm

* Agena 50mm Deluxe Straight-Through Guide Scope

* ZWO ASI-120MC for guiding

* Moonlite Autofocuser

**Acquisition:** 14 hours 18 minutes (Camera at Unity Gain, -20°C)

* CLS- 308x120"

* Red- 81x60""

* Green- 80x60"

* Blue- 81x60"

* Darks- 30

* Flats- 30 per filter

**Capture Software:**

* EQMod mount control. Captured using [N.I.N.A.](nighttime-imaging.eu/) and PHD2 for guiding and dithering.

**PixInsight Processing:**

* [Blink](youtu.be/sJeuWZNWImE?t=40)

* BatchPreProcessing

* StarAlignment

* ImageIntegration

* DrizzleIntrgration (2X, VarK 1.5)

* DynamicCrop

* DynamicBackgroundExtraction 2X

**CLS:**

* Deconvolution

* TGV/MMT noise reduction

* ArcsinhStretch

* HistogramTransformation

* ACDNR

**RGB:**

* StarAlignment to drizzled CLS stack

* LinearFit to green

* ChannelCombination

* AutomaticBackgroundExtraction

* PhotometricColorCalibration

* HSV Repair

* ArcsinhStretch

* HistogramTransformation

* LRGBCombination with CLS

* ACDNR

* LocalHistogramEqualization

* [Curve](i.imgur.com/1gNBR6K.jpg)Transformations for lightness and saturation (with range masks)

* SCNR

* MorphologicalTransformation to reduce star sizes

* Annotation

Final
Original
B

B

Description: annotated version

Uploaded: ...

Suburban Astrophotography
ZWO ASI1600MM/QHY163M
/r/astrophotography
Broadband under Bortle 7/8/9

	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
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Status	Advanced success
Started	...
Astrometry.net job	3458594
PixInsight job	6ZNXCATYUD24MZC6GW0N26EBNIKIESRM
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	12h33m41s.937
RA (top/left)	12h36m01s.850
RA (top/right)	12h29m58s.134
RA (bottom/right)	12h31m23s.621
RA (bottom/left)	12h37m25s.264

Dec (center)	+14°24′42″.77
Dec (top/left)	+15°10′30″.79
Dec (top/right)	+14°41′55″.50
Dec (bottom/right)	+13°38′44″.72
Dec (bottom/left)	+14°07′14″.79

Image Index:

Contribution Index (beta):

M88 and M91

M88 and M91

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Image Index:

Contribution Index (beta):

M88 and M91

M88 and M91

Equipment

Acquisition details

Description

Comments

Revisions

B

Sky plot

Histogram

In these public groups

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